package com.zd.eat.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zd.eat.common.CustomException;
import com.zd.eat.dto.SetmealDto;
import com.zd.eat.entity.Setmeal;
import com.zd.eat.entity.SetmealDish;
import com.zd.eat.mapper.SetmealMapper;
import com.zd.eat.service.SetmealDishService;
import com.zd.eat.service.SetmealService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.stream.Collectors;

@Service
@Slf4j
public class SetmealServiceImpl extends ServiceImpl<SetmealMapper, Setmeal> implements SetmealService {

    @Autowired
    private SetmealDishService setmealDishService;
    /**
     * 新增套餐，同时保存套餐和菜品的关联关系
     * @param setmealDto
     */

    @Override
    @Transactional
    public void saveWithDish(SetmealDto setmealDto) {
        //保存套餐的基本信息，操作setmeal，执行insert操作
        this.save(setmealDto);

        List<SetmealDish> setmealDishes = setmealDto.getSetmealDishes();
        //因为这里面没有保存SetmealId的值，所以使用流的方法写入
//        setmealDishes.stream().map((item)->{
//            item.setSetmealId(setmealDto.getId());
//            return item;
//        }).collect(Collectors.toList());
        //换了个写法
        for (SetmealDish setmealDish : setmealDishes) {
            setmealDish.setSetmealId(setmealDto.getId());
        }

        //保存套餐和菜品的关联信息，操作setmeal_dish,执行insert操作
        setmealDishService.saveBatch(setmealDishes);

    }

    /**
     * 删除套餐，同时需要删除套餐和菜品的关联数据
     * @param ids
     */
    @Transactional
    @Override
    public void removeWithDish(List<Long> ids) {
        //select count(*) from setmeal where id in(1,2,3) and status=1
        //查询套餐的状态，确定是否可以删除
        LambdaQueryWrapper<Setmeal> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.in(Setmeal::getId,ids);
        queryWrapper.eq(Setmeal::getStatus,1);

        int count = this.count(queryWrapper);
        if (count>0){
            //如果不能删除，抛出一个业务异常
            throw new CustomException("套餐正在售卖中，不能删除");
        }
        //如果可以删除，先删除套餐中的数据
        this.removeByIds(ids);
//        delete from setmeal_dish where setmeal_id in(1,2,3)
        LambdaQueryWrapper<SetmealDish> lambdaQueryWrapper=new LambdaQueryWrapper<>();
        lambdaQueryWrapper.in(SetmealDish::getSetmealId,ids);
        //再来删除关系表中的数据
        setmealDishService.remove(lambdaQueryWrapper);
    }
}
